在任何運行時錯誤默認為異常處理程序之前，如何讓@ExceptionHandlers處理特定的異常？

Question

我想使用@ExceptionHandler來處理任何Hibernate異常。 如果該異常不是Hibernate異常，則針對運行時錯誤的@ExceptionHandler會處理該異常。

問題是，運行時異常始終優先於Hibernate異常處理程序。 意思是，發生的任何休眠異常都由常規的運行時異常處理程序處理。

如何確保Hibernate異常由其異常處理程序處理，而不是由Runtime異常處理？

    '@ExceptionHandler(HibernateException.class)
public String handleHibernateException(HibernateException exc, Model theModel) {

    String message = "An error has occured: " + exc.getLocalizedMessage() + "\n" + exc.getCause().toString()
            + "\r\n";

    myLogger.warning(message);

    theModel.addAttribute("exception", message);

    return "testing";
}

// handle any other runtime/unchecked exception and log it

@ExceptionHandler(RuntimeException.class)
public String handleRuntimeExceptions(RuntimeException exc, Model theModel) {

    String message = "An error has occured: " + exc.getLocalizedMessage() + "\n" + exc.getCause().toString()
            + "\r\n";
    myLogger.warning(message);

    theModel.addAttribute("exception", message);

    return "testing";
}'

Answer 1

您可以通過以下方式檢查異常是否為HibernateException的實例：

@ExceptionHandler(RuntimeException.class)
public String handleRuntimeExceptions(RuntimeException exc, Model theModel) {
    if (exc instanceof HibernateException) {
        return handleHibernateException((HibernateException) exc.getCause(), theModel);
    } else if (exc.getCause() instanceof HibernateException) {
        HibernateException hibernateException = (HibernateException) exc.getCause();
        return handleHibernateException(hibernateException, theModel);
    }
    String message = "An error has occurred: " + exc.getLocalizedMessage() + "\n" + exc.getCause().toString() + "\r\n";
    myLogger.warning(message);
    theModel.addAttribute("exception", message);
    return "testing";
}